GERMAN F1 star Sebastian Vettel is looking for a move to Mercedes or McLaren after being left frustrated by his Red Bull car's performance.

SEBASTIAN VETTEL has become a shock threat to the F1 futures of both Lewis Hamilton and Jenson Button.

The world champion is unhappy with the performance of his lacklustre Red Bull racer that’s cost him his crown – and has thrown his hat in the ring for a drive at pace-setters Mercedes.

At the same time he’s become the chief target for McLaren as they team up with Honda for 2015.

As the sport prepared for the 11th round on the sun-baked plain outside Budapest the driver merry-go-round started to pick up speed ahead of the summer break.

Vettel’s first choice beyond the team that has made him a four-time champion is surely rampant Mercedes who have won nine of the first 10 races this season and threaten to dominate the sport for years to come.

Asked if he found the Mercedes three-pointed star ‘sexy’ Vettel replied: “At the moment no, because it is constantly in front of us.

“But if stars mean titles, then stars are something great. As a sportsman you should always have the goal to be as high as possible.”

Vettel has a performance escape clause and should Red Bull end the season out of the top three his options are varied.

But in Hungary yesterday Hamilton insisted he was not concerned as he looks to tie-up a contract extension on his deal that runs out at the end of 2015.

And he said: “I’m not worried. Another German driver? I’m not sure if that’s something Mercedes would like.”